I really like the self-examination that Ian and his team at Lonely Planet are doing here. Instead of creating a framework for creating a living style guide and calling it done, they’re constantly looking at what could be done better, and revisiting earlier decisions.

I’m intrigued by the way they’ve decided to reorganise their files by component rather than by filetype.

Mark Otto talks through the state of Github’s CSS and the processes behind updating it. There’s a nice mix of pragmatism and best practices, together with a recognition that there’s always room for improvement.

Bert Bos's 2000 Treatise (published in 2003) is a must-read for anyone involved in developing any kind of format.
"This essay tries to make explicit what the developers in the various W3C working groups mean when they invoke words like efficiency, maintainability, accessibility, extensibility, learnability, simplicity, longevity, and other long words ending in -y."